jsexpr

jsexpr

String and JSON expression interpolator and evaluator. Interpolates or evaluates a string against a json object, or transforms an object into another based on a json template.

Installation

npm install jsexpr

String Evaluation

const expression = require("jsexpr");

var fn = expression.fn("(${host}=='mymachine' || ${host}=='yourmachine') && ${appName}=='su'");

// Result: false
var result = fn({host:"mymachine",appName:23});

String Interpolation

const expression = require("jsexpr");

var expr = expression.expr("/var/${date}/${client.address}/file.log");

// Result: /var/2017-01-01/localhost/file.log
var result = expr({date:"2017-01-01",client:{address:"localhost"}});

Object Interpolation

const expression = require("jsexpr");

var jsexpr = expression.expr({
	time : "${client}/${address.host}:${address.port}",
	data : {
		request : {
			headers : "${headers}"
		}
	}
});

var result = jsexpr({
	client : "HOST001",
	address : {
		host : "localhost",
		port : 8080
	},
	headers : "Content-Type: application/json"
});

Object Interpolation Result

{
	time: 'HOST001/localhost:8080',
	data: {
		request: {
			headers: 'Content-Type: application/json'
		}
	}
}